Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a161f444d43412…

MALICIOUS

PDF

41.2 KB Created: 2020-10-09 09:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 9d9015ce1a5b763d428dfc00283c0473 SHA-1: adf2a072d49ae09aca8413319c521d10b767cdc1 SHA-256: 23a161f444d434129592612afb66d9792fd3f54601cf340e71c611a58a241a4d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=creative+and+critical+thinking+notes+pdf In PDF document text
    • http://files.eaglendt.services/uploads/1/3/1/3/131398279/semegakodivolibuwo.pdfIn PDF document text
    • http://durofefe.ketimages.com/uploads/1/3/2/6/132695569/2c802.pdfIn PDF document text
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdfIn PDF document text
    • http://files.wickedwomeninwords.com/uploads/1/3/1/8/131856708/panopufide_fajevunafuvume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79b4f82-3c36-497a-941a-71cb843b0043/rexijivoxazede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88ae3ad-b0d2-478b-871d-6cbf8e1a0633/86563386335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08426b1-a5f0-4922-a87d-c7c25d435e89/gotarojaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad097e7-5690-4169-903b-a8e7841df834/xijibefixatojaloxuxuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788375f5-163f-460c-aaf9-bc883d7232dd/buvuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5274/6920/files/dsm_5_citation_apa_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/geometry_dash_apk_full_version_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6845/9674/files/7314689513.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/alameda_unified_school_district_enrollment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/59417282484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0241/2196/files/declaration_of_independence_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/bohemian_rhapsody_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0627/3954/files/book_of_virtues_videos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 5444 bytes
SHA-256: cceebff8346515c1bb72fd4a47d61f99126cb3e87851e477d98956ae84b3cdb9
font_01_sfnt_off000074d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 10232 bytes
SHA-256: 607d93fcf7ebddb0ee7a7c4a8ff5e398e4c77487509666806a1ed2b6a4c17e42

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